I started using the CB Digital OPK last month. I was so frustrated because I had 17 days of flashing smiley faces. I chose to stop because of how upset I got everyday. At the last minute I decided to try again this month. I had 3 days of a solid O and then eight days of flashing smiley faces. I was almost ready to throw in the towel, but this morning I got a solid smiley face! I'm so excited, I know that there are so many factors when TTC but this give me hope. I hope everyone here is having all kinds of good luck as well!